Here is the full list of all 51 Jrago The Demon Hunter achievements.
Kill 1 Demon
Eliminate 10 Demons
Destroy 100 Demons
Hunt 1000 Demons
Slay 10000 Demons
Obtain Hunter Sword
Obtain Demon Slayer
Obtain Masamune
Obtain Excalibur
Obtain Wrath of God
Defeat Semjaza
Defeat Azazel
Defeat Armaros
Defeat Baraqijal
Defeat Kokabel
Defeat Ezeqeel
Defeat Araquiel
Defeat Shamsiel
Defeat Sariel
Defeat Arakiba
Defeat Samsapeel
Defeat Rameel
Defeat Tamiel
Defeat Ramiel
Defeat Danel
Defeat Batarel
Defeat Zaqiel
Defeat Jomjael
Defeat Turel
Defeat Satarel
Defeat Death
Defeat Satan
Defeat Behemoth
Defeat Leviathan
Defeat Lucifer
Obtain 100% Completion
Obtain Hermes Sandals
Obtain Silver Armor
Find Sage
Find Akilian
Find Arbek
Find Shred
Find Seidule
Defeat Lucky Rabbit
Obtain Heal Spell
Obtain Fire Spell
Obtain Elevate Spell
Obtain Teleport Spell
Obtain Holy Spell
Clear the game on any difficulty
Defeat Baal